hot under the collar

baking hot

Very hot.

blow hot air

To engage in empty or exaggerated talk that lacks substance, credibility, or truth; to bluster.

blow hot and cold

To behave inconsistently; to vacillate or to waver, as between extremes of opinion or emotion.

boiling hot

Extremely hot (having a high temperature: of an object, the weather, a living creature).

come in hot

To enter the scene of conflict quickly and aggressively.

feel someone's collar

To arrest someone.

full of hot air

Talking a lot, especially without saying anything of value or meaning.

hissing hot

Very hot.